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@article{DE_1968_4_6_a15, author = {Yu. K. Lando}, title = {The index and the normal solvability of integro-differential operators}, journal = {Differencialʹnye uravneni\^a}, pages = {1112--1126}, publisher = {mathdoc}, volume = {4}, number = {6}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_6_a15/} }
Yu. K. Lando. The index and the normal solvability of integro-differential operators. Differencialʹnye uravneniâ, Tome 4 (1968) no. 6, pp. 1112-1126. http://geodesic.mathdoc.fr/item/DE_1968_4_6_a15/